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Effects of pesticides on community composition and activity of sediment microbes: responses at various levels of microbial community organization
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
2008 (English)In: Environmental Pollution, ISSN 0269-7491, E-ISSN 1873-6424, Vol. 152, no 3, 576-584 p.Article in journal (Refereed) Published
Abstract [en]

A freshwater sediment was exposed to the pesticides captan, glyphosate, isoproturon, and pirimicarb at environmentally relevant and high concentrations. Effects on sediment microorganisms were studied by measuring bacterial activity, fungal and total microbial biomass as community-level endpoints. At the sub-community level, microbial community structure was analysed (PLFA composition and bacterial 16S rRNA genotyping, T-RFLP). Community-level endpoints were not affected by pesticide exposure. At lower levels of microbial community organization, however, molecular methods revealed treatment-induced changes in community composition. Captan and glyphosate exposure caused significant shifts in bacterial community composition (as T-RFLP) at environmentally relevant concentrations. Furthermore, differences in microbial community composition among pesticide treatments were found, indicating that test compounds and exposure concentrations induced multidirectional shifts. Our study showed that community-level end points failed to detect these changes, underpinning the need for application of molecular techniques in aquatic ecotoxicology.

Place, publisher, year, edition, pages
2008. Vol. 152, no 3, 576-584 p.
Keyword [en]
pesticides, sediment, microbial communities, PLEA, genetic fingerprinting
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-16666DOI: 10.1016/j.envpol.2007.07.003ISI: 000255432400008PubMedID: 17822816OAI: oai:DiVA.org:uu-16666DiVA: diva2:44437
Available from: 2008-06-02 Created: 2008-06-02 Last updated: 2017-12-08Bibliographically approved

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Bertilsson, Stefan

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